Teledyne API T703/T703U Calibrator Operation Manual Getting Started
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There are two methods for energizing the control inputs. The internal +5V
available from the pin labeled ā+ā is the most convenient method. However, if
full isolation is required, an external 5 VDC power supply should be used.
Example of Local Power Connections
Example of External Power Connections
Figure 3-11: Digital Control Input Connectors